自由活塞氢内燃机性能仿真分析

李延骁¹，杨君¹，王明杰²，侯庆高¹，王健¹

1.山东交通学院 汽车工程学院，山东 济南  250357；2.山东交通学院 机动车检测实验中心，山东 济南  250100

摘要：利用MATLAB/Simulink对自由活塞氢内燃机建立动力学与热力学模型，运用状态机描述工作过程中离散状态及事件，并对工作过程进行数值模拟，研究点火位置与燃空当量比对自由活塞氢内燃机性能的影响。仿真研究结果表明：点火位置适当推后有助于提高自由活塞氢内燃机指示功率与指示热效率；增大燃空当量比可以提高自由活塞氢内燃机压缩比与运行频率，指示功率显著增大，指示热效率在燃空当量比为0.7时最高。

关键词：自由活塞；氢燃料；内燃机；指示功率；指示热效率

Simulation analysis of performance for free piston hydrogen internal combustion engine

LI Yanxiao¹, YANG Jun¹, WANG Mingjie², HOU Qinggao¹, WANG Jian¹

1.School of Automotive Engineering，Shandong Jiaotong University，Jinan 250357，China；

2.Motor Vehicle Testing Center，Shandong Jiaotong University，Jinan 250100，China

Abstract：MATLAB/Simulink is used to model the dynamics and thermodynamics of a free piston hydrogen internal combustion engine, a state machine is used to describe discrete states and events during the working process, and numerical simulations of the working process is proposed to study the impact of ignition position and fuel air equivalence ratio on the performance of a free piston hydrogen internal combustion engine. The simulation research results indicates that appropriately pushing the ignition position could help improve the indicated power and indicated thermal efficiency of a free piston hydrogen internal combustion engine. Increasing the fuel air equivalence ratio can improve the compression ratio and operating frequency of a free piston hydrogen internal combustion engine significantly, the highest indicated power and indicating thermal efficiency are achieved at a fuel air equivalence ratio of 0.7.

Keywords:free piston;hydrogen fuel;internal combustion engine;indicated power;indicated thermal efficiency